The Department of Defense, specifically the Department of the Navy through NAVSUP Weapon Systems Support, is seeking proposals for the repair and modification of a navigation set, identified by NSN 7R-5826-200096159-B4. The procurement involves a quantity of five units, with delivery terms set to FOB Origin, and requires government source approval prior to contract award due to the flight-critical nature of the item and the inadequacy of available technical data for open competition. Interested vendors must provide comprehensive documentation as outlined in the NAVSUP WSS Source Approval Information Brochures, and proposals must be submitted within 45 days of the notice, with the primary contact for inquiries being Jake Kucowski at (215) 679-2012 or via email at JAKE.KUCOWSKI.CIV@US.NAVY.MIL.